KeepVid

http://keepvid.com/

Keepvid is a free online video download made specifically for

downloading videos from YouTube so that you can save 

to your hard drive, PSP, flash drive, etc.

Keepvid offers two different file types when downloading.

.FLV, which is a flashvideo file that YouTube mainly uses when streaming

and .MP4, which is the standard video file format.

Also a list of each given view type is listed as well.

videos can be downloaded as both file formats from very 240i (very low qaulity) 

to 1080p (extreme high definition).

File size

Varies

Supported platforms

All